fix: mount server-expose at /api/server/expose

The handlers register at root `/`, so mounting at `/api/server` exposed
them at `/api/server`, not `/api/server/expose` like the CLI expects.
Move the mount one level deeper.

Author: knowsuchagency

server/app.ts

@@ -97,7 +97,7 @@ export function createApp() {
   app.route('/api/copier', copierRoutes)
   app.route('/api/github', githubRoutes)
   app.route('/api/monitoring', monitoringRoutes)
-  app.route('/api/server', serverExposeRoutes)
+  app.route('/api/server/expose', serverExposeRoutes)
   app.route('/api/system', systemRoutes)
   app.route('/api/exec', execRoutes)
   app.route('/api/apps', appsRoutes)